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Method and apparatus for estimation of channel temporal correlation and MIMO mode selection in LTE system

a channel temporal correlation and channel temporal correlation technology, applied in the field of telecommunications, can solve the problems of difficult to achieve the time correlation estimation task in practice, and the inappropriate resource of 1 ms separated references for the estimation task, and achieve the effect of favorable structural properties

Active Publication Date: 2013-02-21
HONG KONG APPLIED SCI & TECH RES INST
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Benefits of technology

The present invention relates to a method and apparatus for switching between open loop and closed loop modes in a MIMO communication system. The invention addresses the problem of estimating the Doppler frequency with high granularity, which is important for MIMO mode selection. The invention proposes to use the SRS for Doppler estimation, which has favorable structural properties, such as periodic time-domain allocation and constant frequency-domain allocation. The invention also proposes a method for determining the threshold value for mode switching based on the PMI change probability. The technical effect of the invention is to enable effective mode switching between closed loop mode and open loop mode in an LTE system, particularly in an indoor environment.

Problems solved by technology

However, such a time correlation estimation task is hard to be achieved in practice, where various distortions and noise can easily disturb the estimation result.
Hence, 1 ms separated references should be an inappropriate resource for the estimation task.

Method used

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  • Method and apparatus for estimation of channel temporal correlation and MIMO mode selection in LTE system

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Embodiment Construction

[0037]To further enhance understanding of the present invention, Doppler estimation is briefly discussed below.

[0038]Doppler estimation is to estimate a Doppler frequency. For mobile radios, where multi-path propagation is common, the phase relationship between the components of various mobile radios changes, so the resultant signal at the receiver is spectrally spread. This spectral spread is known as Doppler spread. When relative motion exists in the absence of multipath propagation, there is only one received signal and there is a shift of the received signal in frequency, but no spreading of the received signal spectrum. This phenomenon is known as Doppler shift.

[0039]The present invention applies for any manner of time variation of the channel, including but not limited to Doppler spread and Doppler shift. For the present embodiment, the case of Doppler spread is studied, rather than Doppler shift. Doppler frequency is defined as the highest Doppler offset for Doppler spread, o...

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Abstract

The present invention relates to a method and apparatus for channel temporal correlation estimation and MIMO mode selection. An embodiment of the invention under LTE system utilizes SRS symbols for temporal correlation estimation and performs MIMO mode selection based on the said temporal correlation estimation.

Description

TECHNICAL FIELD[0001]The present application relates generally to telecommunications. In particular, the present application relates to wireless communication networks with systems using multiple antennas, for example, MIMO (multiple-input-multiple-output) antennas.BACKGROUND[0002]In a MIMO communication system, multiple antennas are used at both the transmitter and the receiver, for example, of a base station (BS). By exploiting the spatial dimensions of the multiple antenna transceiver, concurrent transmissions of signals by multiple antennas can be realized, thus increasing the spectral efficiency and achieving higher data rates without increasing transmission bandwidth.[0003]In general, MIMO communication systems can be broadly classified into two types: open loop systems and closed loop systems. For open loop systems, there is no feedback of channel information from the user equipment to the base station. In contrast, for closed loop systems, feedback of channel information is ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04W24/00H04L12/26
CPCH04B7/01H04B7/0417H04B7/0639H04L25/0204H04L25/0222H04L25/0224H04L27/2647
Inventor ZHAO, XUE-YUANCHAN, WING CHAUWANG, CHENGYE, HENRY HUI
Owner HONG KONG APPLIED SCI & TECH RES INST
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